A kind of silver-doped titanium dioxide nanometer antibacterial agent and preparation method thereof
A nano-antibacterial agent, titanium dioxide technology, applied in the field of silver-doped titanium dioxide nano-antibacterial agent and its preparation, can solve problems such as limited application, achieve long-lasting and effective antibacterial effect, excellent antibacterial and antifungal effect, and improve stability.
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Embodiment 1
[0032] A preparation method of silver-doped titanium dioxide nanometer antibacterial agent, it comprises the following steps:
[0033] (1) preparation of titanium dioxide sol by hydrolysis and polycondensation;
[0034] Add butyl titanate and water to ethanol for hydrolysis and polycondensation reaction, and also add hydrolysis reaction inhibitor acetic acid to control the hydrolysis reaction speed, wherein the molar ratio of butyl titanate, water, ethanol and acetic acid is 1:2.5: 10:2; react to get titanium dioxide sol; the temperature of hydrolysis and polycondensation reaction is 25℃, and the reaction time is 12h.
[0035] (2) preparation of silver-doped titania sol;
[0036] Add complexation stabilizer citric acid to the silver nitrate solution, then slowly add it dropwise to the above-mentioned titanium dioxide sol, and fully react to obtain the silver-doped titanium dioxide sol; wherein the molar ratio of silver nitrate to citric acid is 100, and the molar ratio of sil...
Embodiment 2
[0042] A preparation method of silver-doped titanium dioxide nanometer antibacterial agent, it comprises the following steps:
[0043] (1) preparation of titanium dioxide sol by hydrolysis and polycondensation;
[0044] Add butyl titanate and water to ethanol for hydrolysis and polycondensation reaction, and also add hydrolysis reaction inhibitor acetic acid to control the hydrolysis reaction speed, wherein the molar ratio of butyl titanate, water, ethanol and acetic acid is 1:2.8: 11:2.2; react to obtain titanium dioxide sol; the temperature of hydrolysis and polycondensation reaction is 28°C, and the reaction time is 13.5h.
[0045] (2) preparation of silver-doped titania sol;
[0046] Add complexation stabilizer citric acid to the silver nitrate solution, then slowly add it dropwise into the above-mentioned titanium dioxide sol, and fully react to obtain the silver-doped titanium dioxide sol; wherein the molar ratio of silver nitrate to citric acid is 150, and the molar ra...
Embodiment 3
[0052] A preparation method of silver-doped titanium dioxide nanometer antibacterial agent, it comprises the following steps:
[0053] (1) Hydrolysis and polycondensation prepare titanium dioxide sol;
[0054] Add butyl titanate and water to ethanol for hydrolysis and polycondensation reaction, and also add hydrolysis reaction inhibitor acetic acid to control the hydrolysis reaction speed, wherein the molar ratio of butyl titanate, water, ethanol and acetic acid is 1:3: 12:2.5; react to obtain titanium dioxide sol; the temperature of hydrolysis and polycondensation reaction is 30°C, and the reaction time is 15h.
[0055] (2) preparation of silver-doped titania sol;
[0056] Add complexation stabilizer citric acid to the silver nitrate solution, then slowly add it dropwise to the above-mentioned titanium dioxide sol, and fully react to obtain the silver-doped titanium dioxide sol; wherein the molar ratio of silver nitrate to citric acid is 200, and the molar ratio of silver nitr...
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